A diagram showing a cross-section of the subsurface, including the unsaturated zone.
![A diagram showing a cross-section of the subsurface, including the unsaturated zone.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/aquifer.gif?itok=oIOu7zw4)
Detailed Description
A diagram showing a cross-section of the subsurface, including the unsaturated zone. Credit: USGS
A diagram showing a cross-section of the subsurface, including the unsaturated zone. Credit: USGS